Withdraw from Rollup

While withdrawing from any rollup back to mainnet, we are required to send 2 transactions (one on L2 and after challenge period is over, another trx on mainnet). Suppose I complete the first transaction and I have waited out the 7 days but I do not send the second trx on L1, where is my ETH during this period? Will I be able to transact with this ETH either on L1 or L2?